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TV is in high voltage shutdown protection mode. Check to see if Horizontal output transistor is shorted or open. If not then resolder all solder joints on HV transformer. If this does not fix it then you will need to do voltage checks off of H.O.T. and then possibly a bad HV transformer.
This can be any number of things, here is a possible listing:
1) No High Voltage (check the IHVT or the trippler)
2) CRT filament transformer winding open (check the windings that supply voltage to the CRT filaments)
3) Video / CRT socket boards bad (highly unlikely but check anyway)
4) High Voltage power supply malfunctioning (related to problem #1)
This listing is a good starting point. I would suggest that you purchase a schematic to aid in testing the voltages mentioned in the 4 steps above. If you have a background in electronics then do the above, if not please ask a qualified TV technician to perform these steps.
This sounds like a power supply problem. 9 times out of 10 you are dealing with soldered components. Now for the bad news, you are not going to solve this problem by just getting the parts that you need as easy as you think, any number of things can be wrong with tis TV. First I would check the Horizontal Output Transistor to see if it is shorted to ground (check the collector in reference to ground), also I would advise checking the Integrated High Voltage Transformer (voltage output test, resistance test, capacitance test and ring test). The tests of the IHVT will tell you if the transformer is bad and in need of replacement. These are the first checks you will need to do.
This may be the shutdown circuit activating due to excessive current I would check the Horizontal Outout transistor, and the IHVT Intergrated High Voltage transformer. These are usually the cause of these problems. I would advise getting this repaired at a TV repair shop, due to the nature of the problem and the section that may have the problem.
I would start by checking the IHVT for High Voltage output this can be done with a HV probe. Then if no HV is present I would check to see if the filament voltage for the CRTs is working, after that I would check the CRTs using a CRT tester (checking for shorts). These are a few of the beginning test that could be done. You will need a schematic of the TV, a High voltage probe, a CRT tester (can be purchased from ebay) and a multimeter. If you do not have experience in electronics, I would suggest having a TV repair person check the TV out for you.
I would suggest do a check on the voltage from the IHVT to the High Voltage multiplier.
This will determine if this is a HV problem or not. If it is not It may be a video delivery problem which would have similar results. In any event both of these tasks I would suggest be preformed by a qualified TV repair technician.
This might be an indication that your voltage tripler have gone bad. You will have to use a HV probe to measure the voltage on the anodes of your Red Green and Blue CRTs to see if there is HV present. Then you will have to measure the voltage off of the IHVT (Integrated High Voltage Transformer) to see if it is delivering the proper voltage to the voltage tripler. If there is not HV at the IHVT then you will have to check the HV and Horizontal Circuits for a problem.
If you do not have the equipment for these checks I would advise that you take the TV to a qualified TV repair shop or have a technician come to you place to check the TV.
This might be a problem with the IHVT (Integrated High Voltage Transformer), I would suggest that you get a qualified TV technician to look at your set because The testing needed involves exposing yourself to dangerous voltages.
Thats the flyback(high voltage transformer) Or the Focus/High Voltage distribution block. In ant case your shouldnt touch eather as there is enough Hi voltage there to kill you. Please seek out a pro to assist you in this repir. A tv set is not a place to experiment with. Good Luck